Question

simplify:(a+b+c)(a+b-c)-2ab​

Answer 1

Answer:

a²+b²+c²+2bc+2ac

Step-by-step explanation:

(a+b+c)(a+b+c)-2ab

= (a+b+c)^2-2ab

we know that [(a+b+c)^2=a^2+b^2+c^2+2ab+2bc+2ac]

=a^2+b^2+c^2+2ab+2bc+2ac-2ab

=a^2+b^2+c^2+2bc+2ac

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